The environmental efficiency of the combined combustion of low grade  Ekibastuz coal and plant biomass

S.K. Myrzaliyeva; Sh.K. Akilbekova; H. Retnawati; S.V. Yermishin

doi:10.31643/2028/6445.35

Authors

S.K. Myrzaliyeva RSE National Center on complex processing of mineral raw materials of the Republic of Kazakhstan
Sh.K. Akilbekova RSE National Center on complex processing of mineral raw materials of the Republic of Kazakhstan
H. Retnawati Yogyakarta State University
S.V. Yermishin RSE National Center on complex processing of mineral raw materials of the Republic of Kazakhstan

DOI:

https://doi.org/10.31643/2028/6445.35

Keywords:

layered combustion, low grade coal, corn biomass, combustion efficiency, carbon footprint decline.

Abstract

This article presents the results of a study on the layered combustion of low-grade Ekibastuz coal blended with biomass additives aimed at improving the energy efficiency and environmental sustainability of small- and medium-scale energy systems. Corn waste, which is a by‑product of agro‑industrial production, was used as a bio‑additive. Comprehensive physico-chemical analysis of the original components was carried out, including determination of their calorific value. Based on the obtained data, fuel mixtures with different biomass contents were prepared, which allowed an in-depth analysis of co-combustion processes and the relationship between the proportion of biomass, the calorific value of the mixture, the combustion efficiency, and the level of pollutant emissions to be determined. The results showed that the most optimal composition is a fuel mixture with a biomass content in the range of 20-30% and coal in the range of 70-80%, providing the best combination of energy and environmental performance. Calculations and experimental studies of layered combustion parameters in installations with a fixed layer have been performed. It was demonstrated that the addition of 20–30% biomass intensifies the combustion process, increases the overall calorific value of the fuel blend, and reduces the concentration of harmful substances in flue gases compared to the combustion of pure coal. Rational process conditions have been defined, including the optimal height of the fuel layer, temperature regimes, and combustion duration. The results confirm the high prospects of using fuel mixtures based on low-grade coal and biomass as a cleaner and more sustainable solution for heat supply of small and medium-sized energy systems in Kazakhstan.

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Author Biographies

S.K. Myrzaliyeva, RSE National Center on complex processing of mineral raw materials of the Republic of Kazakhstan

Doctor of Chemical Sciences, Professor, Head of the Laboratory of Chemical Production Technologies at the National Center on complex processing of mineral raw materials of the Republic of Kazakhstan, 050036, Almaty, Kazakhstan. ORCID ID: https://orcid.org/0000-0003-2997-0716

Sh.K. Akilbekova, RSE National Center on complex processing of mineral raw materials of the Republic of Kazakhstan

Candidate of technical sciences, leading researcher of the Laboratory of chemical production technology, RSE National Center on complex processing of mineral raw materials of the Republic of Kazakhstan, 050036, Almaty, Kazakhstan. ORCID ID: https://orcid.org/0000-0002-3696-1028

H. Retnawati, Yogyakarta State University

Prof., Dr., Yogyakarta State University (Universitas Negeri Yogyakarta), Indonesia. ORCID ID: https://orcid.org/0000-0002-1792-5873

S.V. Yermishin, RSE National Center on complex processing of mineral raw materials of the Republic of Kazakhstan

RSE National Center on complex processing of mineral raw materials of the Republic of Kazakhstan, Leading Engineer at the Laboratory of Chemical Production Technology, 050036, Almaty, Kazakhstan.

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